Designation:D6878/D6878M−21StandardSpecificationforThermoplasticPolyolefin-BasedSheetRoofing1ThisstandardisissuedunderthefixeddesignationD6878/D6878M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversflexiblesheetmadefromthermoplasticpolyolefin(TPO)astheprincipalpolymer,intendedforuseinsingle-plyroofingmembranesexposedtotheweather.Thesheetshallcontainreinforcingfabricsorscrims.1.2Thetestsandpropertylimitsusedtocharacterizethesheetarevaluesintendedtoensureminimumqualityfortheintendedpurpose.In-placeroofsystemdesigncriteria,suchasfireresistance,fieldseamingstrength,materialcompatibility,andupliftresistance,amongothers,arefactorswhichshouldbeconsideredbutarebeyondthescopeofthisspecification.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.4Thisstandardmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety,health,andenvironmentalprac-ticesanddeterminetheapplicabilityofregulatoryrequire-mentspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D471TestMethodforRubberProperty—EffectofLiquidsD573TestMethodforRubber—DeteriorationinanAirOvenD751TestMethodsforCoatedFabricsD1149TestMethodsfo...
